| http://www.w3.org/ns/prov#value | - The median volume-based pore diameter of the sulfuric acid catalysts of the invention is in the range from 0.1 ??m to 5 ??m, preferably from 0.2 ??m to 4 ??m and in particular from 0.3 ??m to 3.2 ??m, with the shape of the pore size distribution of the catalysts whose supports are based on mixtures of uncalcined diatomaceous earths being able to be set via the type and ratio of the various diatoma
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